HttpListenerRequest.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / HttpListenerRequest.cs / 1305376 / HttpListenerRequest.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net { 
    using System; 
    using System.Collections;
    using System.Collections.Specialized; 
    using System.IO;
    using System.Net.Sockets;
    using System.Runtime.InteropServices;
    using System.Security.Authentication.ExtendedProtection; 
    using System.Security.Permissions;
    using System.Globalization; 
    using System.Text; 
    using System.Threading;
    using System.ComponentModel; 
    using System.Diagnostics;
    using System.Security;
    using System.Security.Principal;
    using System.Security.Cryptography; 
    using System.Security.Cryptography.X509Certificates;
 
 
    internal enum ListenerClientCertState {
        NotInitialized, 
        InProgress,
        Completed
    }
 
    unsafe internal class ListenerClientCertAsyncResult : LazyAsyncResult {
        private NativeOverlapped* m_pOverlapped; 
        private byte[] m_BackingBuffer; 
        private UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO* m_MemoryBlob;
        private uint m_Size; 

        internal NativeOverlapped* NativeOverlapped
        {
            get 
            {
                return m_pOverlapped; 
            } 
        }
 
        internal UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO* RequestBlob
        {
            get
            { 
                return m_MemoryBlob;
            } 
        } 

        private static readonly IOCompletionCallback s_IOCallback = new IOCompletionCallback(WaitCallback); 

        internal ListenerClientCertAsyncResult(object asyncObject, object userState, AsyncCallback callback, uint size) : base(asyncObject, userState, callback) {
            // we will use this overlapped structure to issue async IO to ul
            // the event handle will be put in by the BeginHttpApi2.ERROR_SUCCESS() method 
            Reset(size);
        } 
 
        internal void Reset(uint size) {
            if (size == m_Size) 
            {
                return;
            }
            if (m_Size != 0) 
            {
                Overlapped.Free(m_pOverlapped); 
            } 
            m_Size = size;
            if (size == 0) 
            {
                m_pOverlapped = null;
                m_MemoryBlob = null;
                m_BackingBuffer = null; 
                return;
            } 
            m_BackingBuffer = new byte[checked((int) size)]; 
            Overlapped overlapped = new Overlapped();
            overlapped.AsyncResult = this; 
            m_pOverlapped = overlapped.Pack(s_IOCallback, m_BackingBuffer);
            m_MemoryBlob = (UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO*) Marshal.UnsafeAddrOfPinnedArrayElement(m_BackingBuffer, 0);
        }
 
        private static unsafe void WaitCallback(uint errorCode, uint numBytes, NativeOverlapped* nativeOverlapped) {
            // take the ListenerClientCertAsyncResult object from the state 
            Overlapped callbackOverlapped = Overlapped.Unpack(nativeOverlapped); 
            ListenerClientCertAsyncResult asyncResult = (ListenerClientCertAsyncResult) callbackOverlapped.AsyncResult;
 
            GlobalLog.Print("ListenerClientCertAsyncResult#" + ValidationHelper.HashString(asyncResult) + "::WaitCallback() errorCode:[" + errorCode.ToString() + "] numBytes:[" + numBytes.ToString() + "] nativeOverlapped:[" + ((long)nativeOverlapped).ToString() + "]");

            HttpListenerRequest httpListenerRequest = (HttpListenerRequest) asyncResult.AsyncObject;
            object result = null; 
            try {
                if (errorCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_MORE_DATA) 
               { 
                    //There is a bug that has existed in http.sys since w2k3.  Bytesreceived will only
                    //return the size of the inital cert structure.  To get the full size, 
                    //we need to add the certificate encoding size as well.

                    UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO* pClientCertInfo = asyncResult.RequestBlob;
                    asyncResult.Reset(numBytes + pClientCertInfo->CertEncodedSize); 

                    uint bytesReceived = 0; 
                    errorCode = 
                        UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate(
                            httpListenerRequest.HttpListenerContext.RequestQueueHandle, 
                            httpListenerRequest.m_ConnectionId,
                            (uint)UnsafeNclNativeMethods.HttpApi.HTTP_FLAGS.NONE,
                            asyncResult.m_MemoryBlob,
                            asyncResult.m_Size, 
                            &bytesReceived,
                            asyncResult.m_pOverlapped); 
 
                    if(errorCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_IO_PENDING ||
                       errorCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS) 
                    {
                        return;
                    }
                } 

                if (errorCode!=UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS) { 
                    asyncResult.ErrorCode = (int)errorCode; 
                    result = new HttpListenerException((int)errorCode);
                } 
                else {
                    UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO* pClientCertInfo = asyncResult.m_MemoryBlob;
                    if (pClientCertInfo!=null) {
                        GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(httpListenerRequest) + "::ProcessClientCertificate() pClientCertInfo:" + ValidationHelper.ToString((IntPtr)pClientCertInfo) 
                            + " pClientCertInfo->CertFlags:" + ValidationHelper.ToString(pClientCertInfo->CertFlags)
                            + " pClientCertInfo->CertEncodedSize:" + ValidationHelper.ToString(pClientCertInfo->CertEncodedSize) 
                            + " pClientCertInfo->pCertEncoded:" + ValidationHelper.ToString((IntPtr)pClientCertInfo->pCertEncoded) 
                            + " pClientCertInfo->Token:" + ValidationHelper.ToString((IntPtr)pClientCertInfo->Token)
                            + " pClientCertInfo->CertDeniedByMapper:" + ValidationHelper.ToString(pClientCertInfo->CertDeniedByMapper)); 
                        if (pClientCertInfo->pCertEncoded!=null) {
                            try {
                                byte[] certEncoded = new byte[pClientCertInfo->CertEncodedSize];
                                Marshal.Copy((IntPtr)pClientCertInfo->pCertEncoded, certEncoded, 0, certEncoded.Length); 
                                result = httpListenerRequest.ClientCertificate = new X509Certificate2(certEncoded);
                            } 
                            catch (CryptographicException exception) { 
                                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(httpListenerRequest) + "::ProcessClientCertificate() caught CryptographicException in X509Certificate2..ctor():" + ValidationHelper.ToString(exception));
                                result = exception; 
                            }
                            catch (SecurityException exception) {
                                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(httpListenerRequest) + "::ProcessClientCertificate() caught SecurityException in X509Certificate2..ctor():" + ValidationHelper.ToString(exception));
                                result = exception; 
                            }
                        } 
                        httpListenerRequest.SetClientCertificateError((int)pClientCertInfo->CertFlags); 
                    }
 
                }

                // complete the async IO and invoke the callback
                GlobalLog.Print("ListenerClientCertAsyncResult#" + ValidationHelper.HashString(asyncResult) + "::WaitCallback() calling Complete()"); 
            }
            catch (Exception exception) 
            { 
                if (NclUtilities.IsFatal(exception)) throw;
                result = exception; 
            }
            finally {
                if(errorCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_IO_PENDING){
                    httpListenerRequest.ClientCertState = ListenerClientCertState.Completed; 
                }
            } 
 
            asyncResult.InvokeCallback(result);
        } 

        // Will be called from the base class upon InvokeCallback()
        protected override void Cleanup()
        { 
            if (m_pOverlapped != null)
            { 
                m_MemoryBlob = null; 
                Overlapped.Free(m_pOverlapped);
                m_pOverlapped = null; 
            }
            GC.SuppressFinalize(this);
            base.Cleanup();
        } 

        ~ListenerClientCertAsyncResult() 
        { 
            if (m_pOverlapped != null && !NclUtilities.HasShutdownStarted)
            { 
                Overlapped.Free(m_pOverlapped);
                m_pOverlapped = null;  // Must do this in case application calls GC.ReRegisterForFinalize().
            }
        } 
    }
 
 
    public sealed unsafe class HttpListenerRequest/* BaseHttpRequest, */  {
 
        private Uri m_RequestUri;
        private ulong m_RequestId;
        internal ulong m_ConnectionId;
        private SslStatus m_SslStatus; 
        private string m_RawUrl;
        private string m_CookedUrlHost; 
        private string m_CookedUrlPath; 
        private string m_CookedUrlQuery;
        private long m_ContentLength; 
        private Stream m_RequestStream;
        private string m_HttpMethod;
        private TriState m_KeepAlive;
        private Version m_Version; 
        private WebHeaderCollection m_WebHeaders;
        private IPEndPoint m_LocalEndPoint; 
        private IPEndPoint m_RemoteEndPoint; 
        private BoundaryType m_BoundaryType;
        private ListenerClientCertState m_ClientCertState; 
        private X509Certificate2 m_ClientCertificate;
        private int m_ClientCertificateError;
        private RequestContextBase m_MemoryBlob;
        private CookieCollection m_Cookies; 
        private HttpListenerContext m_HttpContext;
        private bool m_IsDisposed = false; 
        internal const uint CertBoblSize = 1500; 
        private string m_ServiceName;
 
        private enum SslStatus : byte
        {
            Insecure,
            NoClientCert, 
            ClientCert
        } 
 
        internal HttpListenerRequest(HttpListenerContext httpContext, RequestContextBase memoryBlob)
        { 
            if (Logging.On) Logging.PrintInfo(Logging.HttpListener, this, ".ctor", "httpContext#" + ValidationHelper.HashString(httpContext) + " memoryBlob# " + ValidationHelper.HashString((IntPtr) memoryBlob.RequestBlob));
            if(Logging.On)Logging.Associate(Logging.HttpListener, this, httpContext);
            m_HttpContext = httpContext;
            m_MemoryBlob = memoryBlob; 
            m_BoundaryType = BoundaryType.None;
 
            // Set up some of these now to avoid refcounting on memory blob later. 
            m_RequestId = memoryBlob.RequestBlob->RequestId;
            m_ConnectionId = memoryBlob.RequestBlob->ConnectionId; 
            m_SslStatus = memoryBlob.RequestBlob->pSslInfo == null ? SslStatus.Insecure :
                memoryBlob.RequestBlob->pSslInfo->SslClientCertNegotiated == 0 ? SslStatus.NoClientCert :
                SslStatus.ClientCert;
            if (memoryBlob.RequestBlob->pRawUrl != null && memoryBlob.RequestBlob->RawUrlLength > 0) { 
                m_RawUrl = Marshal.PtrToStringAnsi((IntPtr) memoryBlob.RequestBlob->pRawUrl, memoryBlob.RequestBlob->RawUrlLength);
            } 
 
            UnsafeNclNativeMethods.HttpApi.HTTP_COOKED_URL cookedUrl = memoryBlob.RequestBlob->CookedUrl;
            if (cookedUrl.pHost != null && cookedUrl.HostLength > 0) { 
                m_CookedUrlHost = Marshal.PtrToStringUni((IntPtr)cookedUrl.pHost, cookedUrl.HostLength / 2);
            }
            if (cookedUrl.pAbsPath != null && cookedUrl.AbsPathLength > 0) {
                m_CookedUrlPath = Marshal.PtrToStringUni((IntPtr)cookedUrl.pAbsPath, cookedUrl.AbsPathLength / 2); 
            }
            if (cookedUrl.pQueryString != null && cookedUrl.QueryStringLength > 0) { 
                m_CookedUrlQuery = Marshal.PtrToStringUni((IntPtr)cookedUrl.pQueryString, cookedUrl.QueryStringLength / 2); 
            }
            m_Version = new Version(memoryBlob.RequestBlob->Version.MajorVersion, memoryBlob.RequestBlob->Version.MinorVersion); 
            m_ClientCertState = ListenerClientCertState.NotInitialized;
            m_KeepAlive = TriState.Unspecified;
            GlobalLog.Print("HttpListenerContext#" + ValidationHelper.HashString(this) + "::.ctor() RequestId:" + RequestId + " ConnectionId:" + m_ConnectionId + " RawConnectionId:" + memoryBlob.RequestBlob->RawConnectionId + " UrlContext:" + memoryBlob.RequestBlob->UrlContext + " RawUrl:" + m_RawUrl + " Version:" + m_Version.ToString() + " Secure:" + m_SslStatus.ToString());
            if(Logging.On)Logging.PrintInfo(Logging.HttpListener, this, ".ctor", "httpContext#"+ ValidationHelper.HashString(httpContext)+ " RequestUri:" + ValidationHelper.ToString(RequestUri) + " Content-Length:" + ValidationHelper.ToString(ContentLength64) + " HTTP Method:" + ValidationHelper.ToString(HttpMethod)); 
            // Log headers
            if(Logging.On) { 
                StringBuilder sb = new StringBuilder("HttpListenerRequest Headers:\n"); 
                for (int i=0; i0) {
                        try {
                            return Encoding.GetEncoding(postDataCharset); 
                        }
                        catch (ArgumentException) { 
                        } 
                    }
                } 
                if (HasEntityBody) {
                    if (ContentType!=null) {
                        string charSet = Helpers.GetAttributeFromHeader(ContentType, "charset");
                        if (charSet!=null) { 
                            try {
                                return Encoding.GetEncoding(charSet); 
                            } 
                            catch (ArgumentException) {
                            } 
                        }
                    }
                }
                return Encoding.Default; 
            }
        } 
 
        public /* override */ long ContentLength64 {
            get { 
                if (m_BoundaryType==BoundaryType.None) {
                    if (GetKnownHeader(HttpRequestHeader.TransferEncoding)==HttpWebRequest.ChunkedHeader) {
                        m_BoundaryType = BoundaryType.Chunked;
                        m_ContentLength = -1; 
                    }
                    else { 
                        m_ContentLength = 0; 
                        m_BoundaryType = BoundaryType.ContentLength;
                        string length = GetKnownHeader(HttpRequestHeader.ContentLength); 
                        if (length!=null) {
                            bool success = long.TryParse(length, NumberStyles.None,  CultureInfo.InvariantCulture.NumberFormat, out m_ContentLength);
                            if (!success) {
                                m_ContentLength = 0; 
                                m_BoundaryType = BoundaryType.Invalid;
                            } 
                        } 
                    }
                } 
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ContentLength_get() returning m_ContentLength:" + m_ContentLength + " m_BoundaryType:" + m_BoundaryType);
                return m_ContentLength;
            }
        } 

        public /* override */ string ContentType { 
            get { 
                return GetKnownHeader(HttpRequestHeader.ContentType);
            } 
        }

        public /* override */ NameValueCollection Headers {
            get { 
                if (m_WebHeaders==null) {
                    m_WebHeaders = UnsafeNclNativeMethods.HttpApi.GetHeaders(RequestBuffer, OriginalBlobAddress); 
                } 
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::Headers_get() returning#" + ValidationHelper.HashString(m_WebHeaders));
                return m_WebHeaders; 
            }
        }

        public /* override */ string HttpMethod { 
            get {
                if (m_HttpMethod==null) { 
                    m_HttpMethod = UnsafeNclNativeMethods.HttpApi.GetVerb(RequestBuffer, OriginalBlobAddress); 
                }
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::HttpMethod_get() returning m_HttpMethod:" + ValidationHelper.ToString(m_HttpMethod)); 
                return m_HttpMethod;
            }
        }
 
        public /* override */ Stream InputStream {
            get { 
                if(Logging.On)Logging.Enter(Logging.HttpListener, this, "InputStream_get", ""); 
                if (m_RequestStream==null) {
                    m_RequestStream = HasEntityBody ? new HttpRequestStream(HttpListenerContext) : Stream.Null; 
                }
                if(Logging.On)Logging.Exit(Logging.HttpListener, this, "InputStream_get", "");
                return m_RequestStream;
            } 
        }
 
        // Requires ControlPrincipal permission if the request was authenticated with Negotiate, NTLM, or Digest. 
        public /* override */ bool IsAuthenticated {
            get { 
                IPrincipal user = HttpListenerContext.User;
                return user != null && user.Identity != null && user.Identity.IsAuthenticated;
            }
        } 

        public /* override */ bool IsLocal { 
            get { 
                return LocalEndPoint.Address.Equals(RemoteEndPoint.Address);
            } 
        }

        internal bool InternalIsLocal {
            get { 
                return LocalEndPoint.Address.Equals(RemoteEndPoint.Address);
            } 
        } 

        public /* override */ bool IsSecureConnection { 
            get {
                return m_SslStatus != SslStatus.Insecure;
            }
        } 

        public /* override */ NameValueCollection QueryString { 
            get { 
                NameValueCollection queryString = new NameValueCollection();
                Helpers.FillFromString(queryString, Url.Query, true, ContentEncoding); 
                return queryString;
            }
        }
 
        public /* override */ string RawUrl {
            get { 
                return m_RawUrl; 
            }
        } 

        public string ServiceName
        {
            get { return m_ServiceName; } 
            internal set { m_ServiceName = value; }
        } 
 
        public /* override */ Uri Url {
            get { 
                return RequestUri;
            }
        }
 
        public /* override */ Uri UrlReferrer {
            get { 
                string referrer = GetKnownHeader(HttpRequestHeader.Referer); 
                if (referrer==null) {
                    return null; 
                }
                Uri urlReferrer;
                bool success = Uri.TryCreate(referrer, UriKind.RelativeOrAbsolute, out urlReferrer);
                return success ? urlReferrer : null; 
            }
        } 
 
        public /* override */ string UserAgent {
            get { 
                return GetKnownHeader(HttpRequestHeader.UserAgent);
            }
        }
 
        public /* override */ string UserHostAddress {
            get { 
                return LocalEndPoint.ToString(); 
            }
        } 

        public /* override */ string UserHostName {
            get {
                return GetKnownHeader(HttpRequestHeader.Host); 
            }
        } 
 
        public /* override */ string[] UserLanguages {
            get { 
                return Helpers.ParseMultivalueHeader(GetKnownHeader(HttpRequestHeader.AcceptLanguage));
            }
        }
 
        public int ClientCertificateError {
            get { 
                if (m_ClientCertState == ListenerClientCertState.NotInitialized) 
                    throw new InvalidOperationException(SR.GetString(SR.net_listener_mustcall, "GetClientCertificate()/BeginGetClientCertificate()"));
                else if (m_ClientCertState == ListenerClientCertState.InProgress) 
                    throw new InvalidOperationException(SR.GetString(SR.net_listener_mustcompletecall, "GetClientCertificate()/BeginGetClientCertificate()"));

                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ClientCertificateError_get() returning ClientCertificateError:" + ValidationHelper.ToString(m_ClientCertificateError));
                return m_ClientCertificateError; 
            }
        } 
 
        internal X509Certificate2 ClientCertificate {
            set { 
                m_ClientCertificate = value;
            }
        }
 
        internal ListenerClientCertState ClientCertState {
            set { 
                m_ClientCertState = value; 
            }
        } 

        internal void SetClientCertificateError(int clientCertificateError)
        {
            m_ClientCertificateError = clientCertificateError; 
        }
 
        public X509Certificate2 GetClientCertificate() { 
            if(Logging.On)Logging.Enter(Logging.HttpListener, this, "GetClientCertificate", "");
            try { 
                ProcessClientCertificate();
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::GetClientCertificate() returning m_ClientCertificate:" + ValidationHelper.ToString(m_ClientCertificate));
            } finally {
                if(Logging.On)Logging.Exit(Logging.HttpListener, this, "GetClientCertificate", ValidationHelper.ToString(m_ClientCertificate)); 
            }
            return m_ClientCertificate; 
        } 

        public IAsyncResult BeginGetClientCertificate(AsyncCallback requestCallback, object state) { 
            if(Logging.On)Logging.PrintInfo(Logging.HttpListener, this, "BeginGetClientCertificate", "");
            return AsyncProcessClientCertificate(requestCallback, state);
        }
 
        public X509Certificate2 EndGetClientCertificate(IAsyncResult asyncResult) {
            if(Logging.On)Logging.Enter(Logging.HttpListener, this, "EndGetClientCertificate", ""); 
            X509Certificate2 clientCertificate = null; 
            try {
                if (asyncResult==null) { 
                    throw new ArgumentNullException("asyncResult");
                }
                ListenerClientCertAsyncResult clientCertAsyncResult = asyncResult as ListenerClientCertAsyncResult;
                if (clientCertAsyncResult==null || clientCertAsyncResult.AsyncObject!=this) { 
                    throw new ArgumentException(SR.GetString(SR.net_io_invalidasyncresult), "asyncResult");
                } 
                if (clientCertAsyncResult.EndCalled) { 
                    throw new InvalidOperationException(SR.GetString(SR.net_io_invalidendcall, "EndGetClientCertificate"));
                } 
                clientCertAsyncResult.EndCalled = true;
                clientCertificate = clientCertAsyncResult.InternalWaitForCompletion() as X509Certificate2;
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::EndGetClientCertificate() returning m_ClientCertificate:" + ValidationHelper.ToString(m_ClientCertificate));
            } finally { 
                if(Logging.On)Logging.Exit(Logging.HttpListener, this, "EndGetClientCertificate", ValidationHelper.HashString(clientCertificate));
            } 
            return clientCertificate; 
        }
 
        public TransportContext TransportContext
        {
            get
            { 
                return new HttpListenerRequestContext(this);
            } 
        } 

        private CookieCollection ParseCookies(Uri uri, string setCookieHeader) { 
            GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ParseCookies() uri:" + uri + " setCookieHeader:" + setCookieHeader);
            CookieCollection cookies = new CookieCollection();
            CookieParser parser = new CookieParser(setCookieHeader);
            for (;;) { 
                Cookie cookie = parser.GetServer();
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ParseCookies() CookieParser returned cookie:" + ValidationHelper.ToString(cookie)); 
                if (cookie==null) { 
                    // EOF, done.
                    break; 
                }
                if (cookie.Name.Length==0) {
                    continue;
                } 
                cookies.InternalAdd(cookie, true);
            } 
            return cookies; 
        }
 
        public CookieCollection Cookies {
            get {
                if (m_Cookies==null) {
                    string cookieString = GetKnownHeader(HttpRequestHeader.Cookie); 
                    if (cookieString!=null && cookieString.Length>0) {
                        m_Cookies = ParseCookies(RequestUri, cookieString); 
                    } 
                    if (m_Cookies==null) {
                        m_Cookies = new CookieCollection(); 
                    }
                    if (HttpListenerContext.PromoteCookiesToRfc2965) {
                        for (int index=0; index 0 && m_BoundaryType == BoundaryType.ContentLength) ||
                    m_BoundaryType == BoundaryType.Chunked || m_BoundaryType == BoundaryType.Multipart; 
            } 
        }
 
        public /* override */ bool KeepAlive
        {
            get
            { 
                if (m_KeepAlive == TriState.Unspecified)
                { 
                    string header = Headers[HttpKnownHeaderNames.ProxyConnection]; 
                    if (string.IsNullOrEmpty(header))
                    { 
                        header = GetKnownHeader(HttpRequestHeader.Connection);
                    }
                    if (string.IsNullOrEmpty(header))
                    { 
                        if (ProtocolVersion >= HttpVersion.Version11)
                        { 
                            m_KeepAlive = TriState.True; 
                        }
                        else 
                        {
                            header = GetKnownHeader(HttpRequestHeader.KeepAlive);
                            m_KeepAlive = string.IsNullOrEmpty(header) ? TriState.False : TriState.True;
                        } 
                    }
                    else 
                    { 
                        header = header.ToLower(CultureInfo.InvariantCulture);
                        m_KeepAlive = header.IndexOf("close") < 0 || header.IndexOf("keep-alive") >= 0 ? TriState.True : TriState.False; 
                    }
                }

                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::KeepAlive_get() returning:" + m_KeepAlive); 
                return m_KeepAlive == TriState.True;
            } 
        } 

        public /* override */ IPEndPoint RemoteEndPoint { 
            get {
                if (m_RemoteEndPoint==null) {
                    m_RemoteEndPoint = UnsafeNclNativeMethods.HttpApi.GetRemoteEndPoint(RequestBuffer, OriginalBlobAddress);
                } 
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::RemoteEndPoint_get() returning:" + m_RemoteEndPoint);
                return m_RemoteEndPoint; 
            } 
        }
 
        public /* override */ IPEndPoint LocalEndPoint {
            get {
                if (m_LocalEndPoint==null) {
                    m_LocalEndPoint = UnsafeNclNativeMethods.HttpApi.GetLocalEndPoint(RequestBuffer, OriginalBlobAddress); 
                }
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::LocalEndPoint_get() returning:" + m_LocalEndPoint); 
                return m_LocalEndPoint; 
            }
        } 

        //should only be called from httplistenercontext
        internal void Close() {
            if(Logging.On)Logging.Enter(Logging.HttpListener, this, "Close", ""); 
            RequestContextBase memoryBlob = m_MemoryBlob;
            if (memoryBlob != null) 
            { 
                memoryBlob.Close();
                m_MemoryBlob = null; 
            }
            m_IsDisposed = true;
            if(Logging.On)Logging.Exit(Logging.HttpListener, this, "Close", "");
        } 

 
        private ListenerClientCertAsyncResult AsyncProcessClientCertificate(AsyncCallback requestCallback, object state) { 
            if (m_ClientCertState == ListenerClientCertState.InProgress)
                throw new InvalidOperationException(SR.GetString(SR.net_listener_callinprogress, "GetClientCertificate()/BeginGetClientCertificate()")); 
            m_ClientCertState = ListenerClientCertState.InProgress;
            HttpListenerContext.EnsureBoundHandle();

            ListenerClientCertAsyncResult asyncResult = null; 
 			//-------------------------------------------------------------------
			//When you configure the HTTP.SYS with a flag value 2 
			//which means require client certificates, when the client makes the 
			//initial SSL connection, server (HTTP.SYS) demands the client certificate
 			// 
			//Some apps may not want to demand the client cert at the beginning
 			//perhaps server the default.htm. In this case the HTTP.SYS is configured
 			//with a flag value other than 2, whcih means that the client certificate is
			//optional.So intially when SSL is established HTTP.SYS won't ask for client 
 			//certificate. This works fine for the default.htm in the case above
			//However, if the app wants to demand a client certficate at a later time 
			//perhaps showing "YOUR ORDERS" page, then the server wans to demand 
			//Client certs. this will inturn makes HTTP.SYS to do the
 			//SEC_I_RENOGOTIATE through which the client cert demand is made 
			//
 			//THE
 
 
 
 
 

  

 
 
 
 
 
 
            if (m_SslStatus != SslStatus.Insecure)
            { 
                // at this point we know that DefaultFlags has the 2 bit set (Negotiate Client certificate)
                // the cert, though might or might not be there. try to retrieve it
                // this number is the same that IIS decided to use
                uint size = CertBoblSize; 
                asyncResult = new ListenerClientCertAsyncResult(this, state, requestCallback, size);
                try { 
                    while (true) 
                    {
                        GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate() calling UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate size:" + size); 
                        uint bytesReceived = 0;

                        uint statusCode =
                            UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate( 
                                HttpListenerContext.RequestQueueHandle,
                                m_ConnectionId, 
                                (uint)UnsafeNclNativeMethods.HttpApi.HTTP_FLAGS.NONE, 
                                asyncResult.RequestBlob,
                                size, 
                                &bytesReceived,
                                asyncResult.NativeOverlapped);

                        GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate() call to UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate returned:" + statusCode + " bytesReceived:" + bytesReceived); 
                        if (statusCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_MORE_DATA)
                        { 
                            UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO* pClientCertInfo = asyncResult.RequestBlob; 
                            size = bytesReceived + pClientCertInfo->CertEncodedSize;
                            asyncResult.Reset(size); 
                            continue;
                        }
                        if (statusCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS &&
                            statusCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_IO_PENDING) { 
                            // someother bad error, possible(?) return values are:
                            // ERROR_INVALID_HANDLE, ERROR_INSUFFICIENT_BUFFER, ERROR_OPERATION_ABORTED 
                            // Also ERROR_BAD_DATA if we got it twice or it reported smaller size buffer required. 
                            throw new HttpListenerException((int)statusCode);
                        } 
                        break;
                    }
                }
                catch { 
                    if (asyncResult!=null) {
                        asyncResult.InternalCleanup(); 
                    } 
                    throw;
                } 
            } else {
                asyncResult = new ListenerClientCertAsyncResult(this, state, requestCallback, 0);
                asyncResult.InvokeCallback();
            } 
            return asyncResult;
        } 
 
        private void ProcessClientCertificate() {
            if (m_ClientCertState == ListenerClientCertState.InProgress) 
                throw new InvalidOperationException(SR.GetString(SR.net_listener_callinprogress, "GetClientCertificate()/BeginGetClientCertificate()"));
            m_ClientCertState = ListenerClientCertState.InProgress;
            GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate()");
			//-------------------------------------------------------------------- 
 			//When you configure the HTTP.SYS with a flag value 2
			//which means require client certificates, when the client makes the 
 			//initial SSL connection, server (HTTP.SYS) demands the client certificate 
 			//
			//Some apps may not want to demand the client cert at the beginning 
 			//perhaps server the default.htm. In this case the HTTP.SYS is configured
			//with a flag value other than 2, whcih means that the client certificate is
			//optional.So intially when SSL is established HTTP.SYS won't ask for client
			//certificate. This works fine for the default.htm in the case above 
 			//However, if the app wants to demand a client certficate at a later time
			//perhaps showing "YOUR ORDERS" page, then the server wans to demand 
 			//Client certs. this will inturn makes HTTP.SYS to do the 
 			//SEC_I_RENOGOTIATE through which the client cert demand is made
			// 
 			//THE


 
 
 
  
 
 
 


 
 
 
            if (m_SslStatus != SslStatus.Insecure) 
            {
                // at this point we know that DefaultFlags has the 2 bit set (Negotiate Client certificate) 
                // the cert, though might or might not be there. try to retrieve it
                // this number is the same that IIS decided to use
                uint size = CertBoblSize;
                while (true) 
                {
                    byte[] clientCertInfoBlob = new byte[checked((int) size)]; 
                    fixed (byte* pClientCertInfoBlob = clientCertInfoBlob) 
                    {
                        UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO* pClientCertInfo = (UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO*) pClientCertInfoBlob; 

                        GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate() calling UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate size:" + size);
                        uint bytesReceived = 0;
 
                        uint statusCode =
                            UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate( 
                                HttpListenerContext.RequestQueueHandle, 
                                m_ConnectionId,
                                (uint)UnsafeNclNativeMethods.HttpApi.HTTP_FLAGS.NONE, 
                                pClientCertInfo,
                                size,
                                &bytesReceived,
                                null); 

                        GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate() call to UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate returned:" + statusCode + " bytesReceived:" + bytesReceived); 
                        if (statusCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_MORE_DATA) { 
                            size = bytesReceived + pClientCertInfo->CertEncodedSize;
                            continue; 
                        }
                        else if (statusCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS) {
                            if (pClientCertInfo!=null) {
                                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate() pClientCertInfo:" + ValidationHelper.ToString((IntPtr)pClientCertInfo) 
                                    + " pClientCertInfo->CertFlags:" + ValidationHelper.ToString(pClientCertInfo->CertFlags)
                                    + " pClientCertInfo->CertEncodedSize:" + ValidationHelper.ToString(pClientCertInfo->CertEncodedSize) 
                                    + " pClientCertInfo->pCertEncoded:" + ValidationHelper.ToString((IntPtr)pClientCertInfo->pCertEncoded) 
                                    + " pClientCertInfo->Token:" + ValidationHelper.ToString((IntPtr)pClientCertInfo->Token)
                                    + " pClientCertInfo->CertDeniedByMapper:" + ValidationHelper.ToString(pClientCertInfo->CertDeniedByMapper)); 
                                if (pClientCertInfo->pCertEncoded!=null) {
                                    try {
                                        byte[] certEncoded = new byte[pClientCertInfo->CertEncodedSize];
                                        Marshal.Copy((IntPtr)pClientCertInfo->pCertEncoded, certEncoded, 0, certEncoded.Length); 
                                        m_ClientCertificate = new X509Certificate2(certEncoded);
                                    } 
                                    catch (CryptographicException exception) { 
                                        GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate() caught CryptographicException in X509Certificate2..ctor():" + ValidationHelper.ToString(exception));
                                    } 
                                    catch (SecurityException exception) {
                                        GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate() caught SecurityException in X509Certificate2..ctor():" + ValidationHelper.ToString(exception));
                                    }
                                } 
                                m_ClientCertificateError = (int)pClientCertInfo->CertFlags;
                            } 
                        } 
                        else {
                            GlobalLog.Assert(statusCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_NOT_FOUND, "HttpListenerRequest#{0}::ProcessClientCertificate()|Call to UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate() failed with statusCode {1}.", ValidationHelper.HashString(this), statusCode); 
                        }
                    }
                    break;
                } 
            }
            m_ClientCertState = ListenerClientCertState.Completed; 
        } 

        private string RequestScheme { 
            get {
                return IsSecureConnection ? "https" : "http";
            }
        } 

        private Uri RequestUri { 
            get { 
                if (m_RequestUri == null) {
 
                    m_RequestUri = HttpListenerRequestUriBuilder.GetRequestUri(
                        m_RawUrl, RequestScheme, m_CookedUrlHost, m_CookedUrlPath, m_CookedUrlQuery);
                }
 
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::RequestUri_get() returning m_RequestUri:" + ValidationHelper.ToString(m_RequestUri));
                return m_RequestUri; 
            } 
        }
 
        /*
        private DateTime IfModifiedSince {
            get {
                string headerValue = GetKnownHeader(HttpRequestHeader.IfModifiedSince); 
                if (headerValue==null) {
                    return DateTime.Now; 
                } 
                return DateTime.Parse(headerValue, CultureInfo.InvariantCulture);
            } 
        }
        */

        private string GetKnownHeader(HttpRequestHeader header) { 
            return UnsafeNclNativeMethods.HttpApi.GetKnownHeader(RequestBuffer, OriginalBlobAddress, (int) header);
        } 
 
        internal ChannelBinding GetChannelBinding()
        { 
            return HttpListenerContext.Listener.GetChannelBindingFromTls(m_ConnectionId);
        }

        internal void CheckDisposed() { 
            if (m_IsDisposed) {
                throw new ObjectDisposedException(this.GetType().FullName); 
            } 
        }
 
        // <


 

        static class Helpers { 
            // 
            // Get attribute off header value
            // 
            internal static String GetAttributeFromHeader(String headerValue, String attrName) {
                if (headerValue == null)
                    return null;
 
                int l = headerValue.Length;
                int k = attrName.Length; 
 
               // find properly separated attribute name
                int i = 1; // start searching from 1 

                while (i < l) {
                    i = CultureInfo.InvariantCulture.CompareInfo.IndexOf(headerValue, attrName, i, CompareOptions.IgnoreCase);
                    if (i < 0) 
                        break;
                    if (i+k >= l) 
                        break; 

                    char chPrev = headerValue[i-1]; 
                    char chNext = headerValue[i+k];
                    if ((chPrev == ';' || chPrev == ',' || Char.IsWhiteSpace(chPrev)) && (chNext == '=' || Char.IsWhiteSpace(chNext)))
                        break;
 
                    i += k;
                } 
 
                if (i < 0 || i >= l)
                    return null; 

               // skip to '=' and the following whitespaces
                i += k;
                while (i < l && Char.IsWhiteSpace(headerValue[i])) 
                    i++;
                if (i >= l || headerValue[i] != '=') 
                    return null; 
                i++;
                while (i < l && Char.IsWhiteSpace(headerValue[i])) 
                    i++;
                if (i >= l)
                    return null;
 
               // parse the value
                String attrValue = null; 
 
                int j;
 
                if (i < l && headerValue[i] == '"') {
                    if (i == l-1)
                        return null;
                    j = headerValue.IndexOf('"', i+1); 
                    if (j < 0 || j == i+1)
                        return null; 
 
                    attrValue = headerValue.Substring(i+1, j-i-1).Trim();
                } 
                else {
                    for (j = i; j < l; j++) {
                        if (headerValue[j] == ' ' || headerValue[j] == ',')
                            break; 
                    }
 
                    if (j == i) 
                        return null;
 
                    attrValue = headerValue.Substring(i, j-i).Trim();
                }

                return attrValue; 
            }
 
            internal static String[] ParseMultivalueHeader(String s) { 
                if (s == null)
                    return null; 

                int l = s.Length;

               // collect comma-separated values into list 

                ArrayList values = new ArrayList(); 
                int i = 0; 

                while (i < l) { 
                   // find next ,
                    int ci = s.IndexOf(',', i);
                    if (ci < 0)
                        ci = l; 

                   // append corresponding server value 
                    values.Add(s.Substring(i, ci-i)); 

                   // move to next 
                    i = ci+1;

                   // skip leading space
                    if (i < l && s[i] == ' ') 
                        i++;
                } 
 
               // return list as array of strings
 
                int n = values.Count;
                String[] strings;

                // if n is 0 that means s was empty string 

                if (n == 0) { 
                    strings = new String[1]; 
                    strings[0] = String.Empty;
                } 
                else {
                    strings = new String[n];
                    values.CopyTo(0, strings, 0, n);
                } 
                return strings;
            } 
 

            private static string UrlDecodeStringFromStringInternal(string s, Encoding e) { 
                int count = s.Length;
                UrlDecoder helper = new UrlDecoder(count, e);

                // go through the string's chars collapsing %XX and %uXXXX and 
                // appending each char as char, with exception of %XX constructs
                // that are appended as bytes 
 
                for (int pos = 0; pos < count; pos++) {
                    char ch = s[pos]; 

                    if (ch == '+') {
                        ch = ' ';
                    } 
                    else if (ch == '%' && pos < count-2) {
                        if (s[pos+1] == 'u' && pos < count-5) { 
                            int h1 = HexToInt(s[pos+2]); 
                            int h2 = HexToInt(s[pos+3]);
                            int h3 = HexToInt(s[pos+4]); 
                            int h4 = HexToInt(s[pos+5]);

                            if (h1 >= 0 && h2 >= 0 && h3 >= 0 && h4 >= 0) {   // valid 4 hex chars
                                ch = (char)((h1 << 12) | (h2 << 8) | (h3 << 4) | h4); 
                                pos += 5;
 
                                // only add as char 
                                helper.AddChar(ch);
                                continue; 
                            }
                        }
                        else {
                            int h1 = HexToInt(s[pos+1]); 
                            int h2 = HexToInt(s[pos+2]);
 
                            if (h1 >= 0 && h2 >= 0) {     // valid 2 hex chars 
                                byte b = (byte)((h1 << 4) | h2);
                                pos += 2; 

                                // don't add as char
                                helper.AddByte(b);
                                continue; 
                            }
                        } 
                    } 

                    if ((ch & 0xFF80) == 0) 
                        helper.AddByte((byte)ch); // 7 bit have to go as bytes because of Unicode
                    else
                        helper.AddChar(ch);
                } 

                return helper.GetString(); 
            } 

            private static int HexToInt(char h) { 
                return( h >= '0' && h <= '9' ) ? h - '0' :
                ( h >= 'a' && h <= 'f' ) ? h - 'a' + 10 :
                ( h >= 'A' && h <= 'F' ) ? h - 'A' + 10 :
                -1; 
            }
 
            private class UrlDecoder { 
                private int _bufferSize;
 
                // Accumulate characters in a special array
                private int _numChars;
                private char[] _charBuffer;
 
                // Accumulate bytes for decoding into characters in a special array
                private int _numBytes; 
                private byte[] _byteBuffer; 

                // Encoding to convert chars to bytes 
                private Encoding _encoding;

                private void FlushBytes() {
                    if (_numBytes > 0) { 
                        _numChars += _encoding.GetChars(_byteBuffer, 0, _numBytes, _charBuffer, _numChars);
                        _numBytes = 0; 
                    } 
                }
 
                internal UrlDecoder(int bufferSize, Encoding encoding) {
                    _bufferSize = bufferSize;
                    _encoding = encoding;
 
                    _charBuffer = new char[bufferSize];
                    // byte buffer created on demand 
                } 

                internal void AddChar(char ch) { 
                    if (_numBytes > 0)
                        FlushBytes();

                    _charBuffer[_numChars++] = ch; 
                }
 
                internal void AddByte(byte b) { 
                    // if there are no pending bytes treat 7 bit bytes as characters
                    // this optimization is temp disable as it doesn't work for some encodings 
    /*
                    if (_numBytes == 0 && ((b & 0x80) == 0)) {
                        AddChar((char)b);
                    } 
                    else
    */ 
                    { 
                        if (_byteBuffer == null)
                            _byteBuffer = new byte[_bufferSize]; 

                        _byteBuffer[_numBytes++] = b;
                    }
                } 

                internal String GetString() { 
                    if (_numBytes > 0) 
                        FlushBytes();
 
                    if (_numChars > 0)
                        return new String(_charBuffer, 0, _numChars);
                    else
                        return String.Empty; 
                }
            } 
 

            internal static void FillFromString(NameValueCollection nvc, String s, bool urlencoded, Encoding encoding) { 
                int l = (s != null) ? s.Length : 0;
                int i = (s.Length>0 && s[0]=='?') ? 1 : 0;

                while (i < l) { 
                    // find next & while noting first = on the way (and if there are more)
 
                    int si = i; 
                    int ti = -1;
 
                    while (i < l) {
                        char ch = s[i];

                        if (ch == '=') { 
                            if (ti < 0)
                                ti = i; 
                        } 
                        else if (ch == '&') {
                            break; 
                        }

                        i++;
                    } 

                    // extract the name / value pair 
 
                    String name = null;
                    String value = null; 

                    if (ti >= 0) {
                        name = s.Substring(si, ti-si);
                        value = s.Substring(ti+1, i-ti-1); 
                    }
                    else { 
                        value = s.Substring(si, i-si); 
                    }
 
                    // add name / value pair to the collection

                    if (urlencoded)
                        nvc.Add( 
                           name == null ? null : UrlDecodeStringFromStringInternal(name, encoding),
                           UrlDecodeStringFromStringInternal(value, encoding)); 
                    else 
                        nvc.Add(name, value);
 
                    // trailing '&'

                    if (i == l-1 && s[i] == '&')
                        nvc.Add(null, ""); 

                    i++; 
                } 
            }
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net { 
    using System; 
    using System.Collections;
    using System.Collections.Specialized; 
    using System.IO;
    using System.Net.Sockets;
    using System.Runtime.InteropServices;
    using System.Security.Authentication.ExtendedProtection; 
    using System.Security.Permissions;
    using System.Globalization; 
    using System.Text; 
    using System.Threading;
    using System.ComponentModel; 
    using System.Diagnostics;
    using System.Security;
    using System.Security.Principal;
    using System.Security.Cryptography; 
    using System.Security.Cryptography.X509Certificates;
 
 
    internal enum ListenerClientCertState {
        NotInitialized, 
        InProgress,
        Completed
    }
 
    unsafe internal class ListenerClientCertAsyncResult : LazyAsyncResult {
        private NativeOverlapped* m_pOverlapped; 
        private byte[] m_BackingBuffer; 
        private UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO* m_MemoryBlob;
        private uint m_Size; 

        internal NativeOverlapped* NativeOverlapped
        {
            get 
            {
                return m_pOverlapped; 
            } 
        }
 
        internal UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO* RequestBlob
        {
            get
            { 
                return m_MemoryBlob;
            } 
        } 

        private static readonly IOCompletionCallback s_IOCallback = new IOCompletionCallback(WaitCallback); 

        internal ListenerClientCertAsyncResult(object asyncObject, object userState, AsyncCallback callback, uint size) : base(asyncObject, userState, callback) {
            // we will use this overlapped structure to issue async IO to ul
            // the event handle will be put in by the BeginHttpApi2.ERROR_SUCCESS() method 
            Reset(size);
        } 
 
        internal void Reset(uint size) {
            if (size == m_Size) 
            {
                return;
            }
            if (m_Size != 0) 
            {
                Overlapped.Free(m_pOverlapped); 
            } 
            m_Size = size;
            if (size == 0) 
            {
                m_pOverlapped = null;
                m_MemoryBlob = null;
                m_BackingBuffer = null; 
                return;
            } 
            m_BackingBuffer = new byte[checked((int) size)]; 
            Overlapped overlapped = new Overlapped();
            overlapped.AsyncResult = this; 
            m_pOverlapped = overlapped.Pack(s_IOCallback, m_BackingBuffer);
            m_MemoryBlob = (UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO*) Marshal.UnsafeAddrOfPinnedArrayElement(m_BackingBuffer, 0);
        }
 
        private static unsafe void WaitCallback(uint errorCode, uint numBytes, NativeOverlapped* nativeOverlapped) {
            // take the ListenerClientCertAsyncResult object from the state 
            Overlapped callbackOverlapped = Overlapped.Unpack(nativeOverlapped); 
            ListenerClientCertAsyncResult asyncResult = (ListenerClientCertAsyncResult) callbackOverlapped.AsyncResult;
 
            GlobalLog.Print("ListenerClientCertAsyncResult#" + ValidationHelper.HashString(asyncResult) + "::WaitCallback() errorCode:[" + errorCode.ToString() + "] numBytes:[" + numBytes.ToString() + "] nativeOverlapped:[" + ((long)nativeOverlapped).ToString() + "]");

            HttpListenerRequest httpListenerRequest = (HttpListenerRequest) asyncResult.AsyncObject;
            object result = null; 
            try {
                if (errorCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_MORE_DATA) 
               { 
                    //There is a bug that has existed in http.sys since w2k3.  Bytesreceived will only
                    //return the size of the inital cert structure.  To get the full size, 
                    //we need to add the certificate encoding size as well.

                    UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO* pClientCertInfo = asyncResult.RequestBlob;
                    asyncResult.Reset(numBytes + pClientCertInfo->CertEncodedSize); 

                    uint bytesReceived = 0; 
                    errorCode = 
                        UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate(
                            httpListenerRequest.HttpListenerContext.RequestQueueHandle, 
                            httpListenerRequest.m_ConnectionId,
                            (uint)UnsafeNclNativeMethods.HttpApi.HTTP_FLAGS.NONE,
                            asyncResult.m_MemoryBlob,
                            asyncResult.m_Size, 
                            &bytesReceived,
                            asyncResult.m_pOverlapped); 
 
                    if(errorCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_IO_PENDING ||
                       errorCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS) 
                    {
                        return;
                    }
                } 

                if (errorCode!=UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS) { 
                    asyncResult.ErrorCode = (int)errorCode; 
                    result = new HttpListenerException((int)errorCode);
                } 
                else {
                    UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO* pClientCertInfo = asyncResult.m_MemoryBlob;
                    if (pClientCertInfo!=null) {
                        GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(httpListenerRequest) + "::ProcessClientCertificate() pClientCertInfo:" + ValidationHelper.ToString((IntPtr)pClientCertInfo) 
                            + " pClientCertInfo->CertFlags:" + ValidationHelper.ToString(pClientCertInfo->CertFlags)
                            + " pClientCertInfo->CertEncodedSize:" + ValidationHelper.ToString(pClientCertInfo->CertEncodedSize) 
                            + " pClientCertInfo->pCertEncoded:" + ValidationHelper.ToString((IntPtr)pClientCertInfo->pCertEncoded) 
                            + " pClientCertInfo->Token:" + ValidationHelper.ToString((IntPtr)pClientCertInfo->Token)
                            + " pClientCertInfo->CertDeniedByMapper:" + ValidationHelper.ToString(pClientCertInfo->CertDeniedByMapper)); 
                        if (pClientCertInfo->pCertEncoded!=null) {
                            try {
                                byte[] certEncoded = new byte[pClientCertInfo->CertEncodedSize];
                                Marshal.Copy((IntPtr)pClientCertInfo->pCertEncoded, certEncoded, 0, certEncoded.Length); 
                                result = httpListenerRequest.ClientCertificate = new X509Certificate2(certEncoded);
                            } 
                            catch (CryptographicException exception) { 
                                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(httpListenerRequest) + "::ProcessClientCertificate() caught CryptographicException in X509Certificate2..ctor():" + ValidationHelper.ToString(exception));
                                result = exception; 
                            }
                            catch (SecurityException exception) {
                                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(httpListenerRequest) + "::ProcessClientCertificate() caught SecurityException in X509Certificate2..ctor():" + ValidationHelper.ToString(exception));
                                result = exception; 
                            }
                        } 
                        httpListenerRequest.SetClientCertificateError((int)pClientCertInfo->CertFlags); 
                    }
 
                }

                // complete the async IO and invoke the callback
                GlobalLog.Print("ListenerClientCertAsyncResult#" + ValidationHelper.HashString(asyncResult) + "::WaitCallback() calling Complete()"); 
            }
            catch (Exception exception) 
            { 
                if (NclUtilities.IsFatal(exception)) throw;
                result = exception; 
            }
            finally {
                if(errorCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_IO_PENDING){
                    httpListenerRequest.ClientCertState = ListenerClientCertState.Completed; 
                }
            } 
 
            asyncResult.InvokeCallback(result);
        } 

        // Will be called from the base class upon InvokeCallback()
        protected override void Cleanup()
        { 
            if (m_pOverlapped != null)
            { 
                m_MemoryBlob = null; 
                Overlapped.Free(m_pOverlapped);
                m_pOverlapped = null; 
            }
            GC.SuppressFinalize(this);
            base.Cleanup();
        } 

        ~ListenerClientCertAsyncResult() 
        { 
            if (m_pOverlapped != null && !NclUtilities.HasShutdownStarted)
            { 
                Overlapped.Free(m_pOverlapped);
                m_pOverlapped = null;  // Must do this in case application calls GC.ReRegisterForFinalize().
            }
        } 
    }
 
 
    public sealed unsafe class HttpListenerRequest/* BaseHttpRequest, */  {
 
        private Uri m_RequestUri;
        private ulong m_RequestId;
        internal ulong m_ConnectionId;
        private SslStatus m_SslStatus; 
        private string m_RawUrl;
        private string m_CookedUrlHost; 
        private string m_CookedUrlPath; 
        private string m_CookedUrlQuery;
        private long m_ContentLength; 
        private Stream m_RequestStream;
        private string m_HttpMethod;
        private TriState m_KeepAlive;
        private Version m_Version; 
        private WebHeaderCollection m_WebHeaders;
        private IPEndPoint m_LocalEndPoint; 
        private IPEndPoint m_RemoteEndPoint; 
        private BoundaryType m_BoundaryType;
        private ListenerClientCertState m_ClientCertState; 
        private X509Certificate2 m_ClientCertificate;
        private int m_ClientCertificateError;
        private RequestContextBase m_MemoryBlob;
        private CookieCollection m_Cookies; 
        private HttpListenerContext m_HttpContext;
        private bool m_IsDisposed = false; 
        internal const uint CertBoblSize = 1500; 
        private string m_ServiceName;
 
        private enum SslStatus : byte
        {
            Insecure,
            NoClientCert, 
            ClientCert
        } 
 
        internal HttpListenerRequest(HttpListenerContext httpContext, RequestContextBase memoryBlob)
        { 
            if (Logging.On) Logging.PrintInfo(Logging.HttpListener, this, ".ctor", "httpContext#" + ValidationHelper.HashString(httpContext) + " memoryBlob# " + ValidationHelper.HashString((IntPtr) memoryBlob.RequestBlob));
            if(Logging.On)Logging.Associate(Logging.HttpListener, this, httpContext);
            m_HttpContext = httpContext;
            m_MemoryBlob = memoryBlob; 
            m_BoundaryType = BoundaryType.None;
 
            // Set up some of these now to avoid refcounting on memory blob later. 
            m_RequestId = memoryBlob.RequestBlob->RequestId;
            m_ConnectionId = memoryBlob.RequestBlob->ConnectionId; 
            m_SslStatus = memoryBlob.RequestBlob->pSslInfo == null ? SslStatus.Insecure :
                memoryBlob.RequestBlob->pSslInfo->SslClientCertNegotiated == 0 ? SslStatus.NoClientCert :
                SslStatus.ClientCert;
            if (memoryBlob.RequestBlob->pRawUrl != null && memoryBlob.RequestBlob->RawUrlLength > 0) { 
                m_RawUrl = Marshal.PtrToStringAnsi((IntPtr) memoryBlob.RequestBlob->pRawUrl, memoryBlob.RequestBlob->RawUrlLength);
            } 
 
            UnsafeNclNativeMethods.HttpApi.HTTP_COOKED_URL cookedUrl = memoryBlob.RequestBlob->CookedUrl;
            if (cookedUrl.pHost != null && cookedUrl.HostLength > 0) { 
                m_CookedUrlHost = Marshal.PtrToStringUni((IntPtr)cookedUrl.pHost, cookedUrl.HostLength / 2);
            }
            if (cookedUrl.pAbsPath != null && cookedUrl.AbsPathLength > 0) {
                m_CookedUrlPath = Marshal.PtrToStringUni((IntPtr)cookedUrl.pAbsPath, cookedUrl.AbsPathLength / 2); 
            }
            if (cookedUrl.pQueryString != null && cookedUrl.QueryStringLength > 0) { 
                m_CookedUrlQuery = Marshal.PtrToStringUni((IntPtr)cookedUrl.pQueryString, cookedUrl.QueryStringLength / 2); 
            }
            m_Version = new Version(memoryBlob.RequestBlob->Version.MajorVersion, memoryBlob.RequestBlob->Version.MinorVersion); 
            m_ClientCertState = ListenerClientCertState.NotInitialized;
            m_KeepAlive = TriState.Unspecified;
            GlobalLog.Print("HttpListenerContext#" + ValidationHelper.HashString(this) + "::.ctor() RequestId:" + RequestId + " ConnectionId:" + m_ConnectionId + " RawConnectionId:" + memoryBlob.RequestBlob->RawConnectionId + " UrlContext:" + memoryBlob.RequestBlob->UrlContext + " RawUrl:" + m_RawUrl + " Version:" + m_Version.ToString() + " Secure:" + m_SslStatus.ToString());
            if(Logging.On)Logging.PrintInfo(Logging.HttpListener, this, ".ctor", "httpContext#"+ ValidationHelper.HashString(httpContext)+ " RequestUri:" + ValidationHelper.ToString(RequestUri) + " Content-Length:" + ValidationHelper.ToString(ContentLength64) + " HTTP Method:" + ValidationHelper.ToString(HttpMethod)); 
            // Log headers
            if(Logging.On) { 
                StringBuilder sb = new StringBuilder("HttpListenerRequest Headers:\n"); 
                for (int i=0; i0) {
                        try {
                            return Encoding.GetEncoding(postDataCharset); 
                        }
                        catch (ArgumentException) { 
                        } 
                    }
                } 
                if (HasEntityBody) {
                    if (ContentType!=null) {
                        string charSet = Helpers.GetAttributeFromHeader(ContentType, "charset");
                        if (charSet!=null) { 
                            try {
                                return Encoding.GetEncoding(charSet); 
                            } 
                            catch (ArgumentException) {
                            } 
                        }
                    }
                }
                return Encoding.Default; 
            }
        } 
 
        public /* override */ long ContentLength64 {
            get { 
                if (m_BoundaryType==BoundaryType.None) {
                    if (GetKnownHeader(HttpRequestHeader.TransferEncoding)==HttpWebRequest.ChunkedHeader) {
                        m_BoundaryType = BoundaryType.Chunked;
                        m_ContentLength = -1; 
                    }
                    else { 
                        m_ContentLength = 0; 
                        m_BoundaryType = BoundaryType.ContentLength;
                        string length = GetKnownHeader(HttpRequestHeader.ContentLength); 
                        if (length!=null) {
                            bool success = long.TryParse(length, NumberStyles.None,  CultureInfo.InvariantCulture.NumberFormat, out m_ContentLength);
                            if (!success) {
                                m_ContentLength = 0; 
                                m_BoundaryType = BoundaryType.Invalid;
                            } 
                        } 
                    }
                } 
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ContentLength_get() returning m_ContentLength:" + m_ContentLength + " m_BoundaryType:" + m_BoundaryType);
                return m_ContentLength;
            }
        } 

        public /* override */ string ContentType { 
            get { 
                return GetKnownHeader(HttpRequestHeader.ContentType);
            } 
        }

        public /* override */ NameValueCollection Headers {
            get { 
                if (m_WebHeaders==null) {
                    m_WebHeaders = UnsafeNclNativeMethods.HttpApi.GetHeaders(RequestBuffer, OriginalBlobAddress); 
                } 
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::Headers_get() returning#" + ValidationHelper.HashString(m_WebHeaders));
                return m_WebHeaders; 
            }
        }

        public /* override */ string HttpMethod { 
            get {
                if (m_HttpMethod==null) { 
                    m_HttpMethod = UnsafeNclNativeMethods.HttpApi.GetVerb(RequestBuffer, OriginalBlobAddress); 
                }
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::HttpMethod_get() returning m_HttpMethod:" + ValidationHelper.ToString(m_HttpMethod)); 
                return m_HttpMethod;
            }
        }
 
        public /* override */ Stream InputStream {
            get { 
                if(Logging.On)Logging.Enter(Logging.HttpListener, this, "InputStream_get", ""); 
                if (m_RequestStream==null) {
                    m_RequestStream = HasEntityBody ? new HttpRequestStream(HttpListenerContext) : Stream.Null; 
                }
                if(Logging.On)Logging.Exit(Logging.HttpListener, this, "InputStream_get", "");
                return m_RequestStream;
            } 
        }
 
        // Requires ControlPrincipal permission if the request was authenticated with Negotiate, NTLM, or Digest. 
        public /* override */ bool IsAuthenticated {
            get { 
                IPrincipal user = HttpListenerContext.User;
                return user != null && user.Identity != null && user.Identity.IsAuthenticated;
            }
        } 

        public /* override */ bool IsLocal { 
            get { 
                return LocalEndPoint.Address.Equals(RemoteEndPoint.Address);
            } 
        }

        internal bool InternalIsLocal {
            get { 
                return LocalEndPoint.Address.Equals(RemoteEndPoint.Address);
            } 
        } 

        public /* override */ bool IsSecureConnection { 
            get {
                return m_SslStatus != SslStatus.Insecure;
            }
        } 

        public /* override */ NameValueCollection QueryString { 
            get { 
                NameValueCollection queryString = new NameValueCollection();
                Helpers.FillFromString(queryString, Url.Query, true, ContentEncoding); 
                return queryString;
            }
        }
 
        public /* override */ string RawUrl {
            get { 
                return m_RawUrl; 
            }
        } 

        public string ServiceName
        {
            get { return m_ServiceName; } 
            internal set { m_ServiceName = value; }
        } 
 
        public /* override */ Uri Url {
            get { 
                return RequestUri;
            }
        }
 
        public /* override */ Uri UrlReferrer {
            get { 
                string referrer = GetKnownHeader(HttpRequestHeader.Referer); 
                if (referrer==null) {
                    return null; 
                }
                Uri urlReferrer;
                bool success = Uri.TryCreate(referrer, UriKind.RelativeOrAbsolute, out urlReferrer);
                return success ? urlReferrer : null; 
            }
        } 
 
        public /* override */ string UserAgent {
            get { 
                return GetKnownHeader(HttpRequestHeader.UserAgent);
            }
        }
 
        public /* override */ string UserHostAddress {
            get { 
                return LocalEndPoint.ToString(); 
            }
        } 

        public /* override */ string UserHostName {
            get {
                return GetKnownHeader(HttpRequestHeader.Host); 
            }
        } 
 
        public /* override */ string[] UserLanguages {
            get { 
                return Helpers.ParseMultivalueHeader(GetKnownHeader(HttpRequestHeader.AcceptLanguage));
            }
        }
 
        public int ClientCertificateError {
            get { 
                if (m_ClientCertState == ListenerClientCertState.NotInitialized) 
                    throw new InvalidOperationException(SR.GetString(SR.net_listener_mustcall, "GetClientCertificate()/BeginGetClientCertificate()"));
                else if (m_ClientCertState == ListenerClientCertState.InProgress) 
                    throw new InvalidOperationException(SR.GetString(SR.net_listener_mustcompletecall, "GetClientCertificate()/BeginGetClientCertificate()"));

                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ClientCertificateError_get() returning ClientCertificateError:" + ValidationHelper.ToString(m_ClientCertificateError));
                return m_ClientCertificateError; 
            }
        } 
 
        internal X509Certificate2 ClientCertificate {
            set { 
                m_ClientCertificate = value;
            }
        }
 
        internal ListenerClientCertState ClientCertState {
            set { 
                m_ClientCertState = value; 
            }
        } 

        internal void SetClientCertificateError(int clientCertificateError)
        {
            m_ClientCertificateError = clientCertificateError; 
        }
 
        public X509Certificate2 GetClientCertificate() { 
            if(Logging.On)Logging.Enter(Logging.HttpListener, this, "GetClientCertificate", "");
            try { 
                ProcessClientCertificate();
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::GetClientCertificate() returning m_ClientCertificate:" + ValidationHelper.ToString(m_ClientCertificate));
            } finally {
                if(Logging.On)Logging.Exit(Logging.HttpListener, this, "GetClientCertificate", ValidationHelper.ToString(m_ClientCertificate)); 
            }
            return m_ClientCertificate; 
        } 

        public IAsyncResult BeginGetClientCertificate(AsyncCallback requestCallback, object state) { 
            if(Logging.On)Logging.PrintInfo(Logging.HttpListener, this, "BeginGetClientCertificate", "");
            return AsyncProcessClientCertificate(requestCallback, state);
        }
 
        public X509Certificate2 EndGetClientCertificate(IAsyncResult asyncResult) {
            if(Logging.On)Logging.Enter(Logging.HttpListener, this, "EndGetClientCertificate", ""); 
            X509Certificate2 clientCertificate = null; 
            try {
                if (asyncResult==null) { 
                    throw new ArgumentNullException("asyncResult");
                }
                ListenerClientCertAsyncResult clientCertAsyncResult = asyncResult as ListenerClientCertAsyncResult;
                if (clientCertAsyncResult==null || clientCertAsyncResult.AsyncObject!=this) { 
                    throw new ArgumentException(SR.GetString(SR.net_io_invalidasyncresult), "asyncResult");
                } 
                if (clientCertAsyncResult.EndCalled) { 
                    throw new InvalidOperationException(SR.GetString(SR.net_io_invalidendcall, "EndGetClientCertificate"));
                } 
                clientCertAsyncResult.EndCalled = true;
                clientCertificate = clientCertAsyncResult.InternalWaitForCompletion() as X509Certificate2;
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::EndGetClientCertificate() returning m_ClientCertificate:" + ValidationHelper.ToString(m_ClientCertificate));
            } finally { 
                if(Logging.On)Logging.Exit(Logging.HttpListener, this, "EndGetClientCertificate", ValidationHelper.HashString(clientCertificate));
            } 
            return clientCertificate; 
        }
 
        public TransportContext TransportContext
        {
            get
            { 
                return new HttpListenerRequestContext(this);
            } 
        } 

        private CookieCollection ParseCookies(Uri uri, string setCookieHeader) { 
            GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ParseCookies() uri:" + uri + " setCookieHeader:" + setCookieHeader);
            CookieCollection cookies = new CookieCollection();
            CookieParser parser = new CookieParser(setCookieHeader);
            for (;;) { 
                Cookie cookie = parser.GetServer();
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ParseCookies() CookieParser returned cookie:" + ValidationHelper.ToString(cookie)); 
                if (cookie==null) { 
                    // EOF, done.
                    break; 
                }
                if (cookie.Name.Length==0) {
                    continue;
                } 
                cookies.InternalAdd(cookie, true);
            } 
            return cookies; 
        }
 
        public CookieCollection Cookies {
            get {
                if (m_Cookies==null) {
                    string cookieString = GetKnownHeader(HttpRequestHeader.Cookie); 
                    if (cookieString!=null && cookieString.Length>0) {
                        m_Cookies = ParseCookies(RequestUri, cookieString); 
                    } 
                    if (m_Cookies==null) {
                        m_Cookies = new CookieCollection(); 
                    }
                    if (HttpListenerContext.PromoteCookiesToRfc2965) {
                        for (int index=0; index 0 && m_BoundaryType == BoundaryType.ContentLength) ||
                    m_BoundaryType == BoundaryType.Chunked || m_BoundaryType == BoundaryType.Multipart; 
            } 
        }
 
        public /* override */ bool KeepAlive
        {
            get
            { 
                if (m_KeepAlive == TriState.Unspecified)
                { 
                    string header = Headers[HttpKnownHeaderNames.ProxyConnection]; 
                    if (string.IsNullOrEmpty(header))
                    { 
                        header = GetKnownHeader(HttpRequestHeader.Connection);
                    }
                    if (string.IsNullOrEmpty(header))
                    { 
                        if (ProtocolVersion >= HttpVersion.Version11)
                        { 
                            m_KeepAlive = TriState.True; 
                        }
                        else 
                        {
                            header = GetKnownHeader(HttpRequestHeader.KeepAlive);
                            m_KeepAlive = string.IsNullOrEmpty(header) ? TriState.False : TriState.True;
                        } 
                    }
                    else 
                    { 
                        header = header.ToLower(CultureInfo.InvariantCulture);
                        m_KeepAlive = header.IndexOf("close") < 0 || header.IndexOf("keep-alive") >= 0 ? TriState.True : TriState.False; 
                    }
                }

                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::KeepAlive_get() returning:" + m_KeepAlive); 
                return m_KeepAlive == TriState.True;
            } 
        } 

        public /* override */ IPEndPoint RemoteEndPoint { 
            get {
                if (m_RemoteEndPoint==null) {
                    m_RemoteEndPoint = UnsafeNclNativeMethods.HttpApi.GetRemoteEndPoint(RequestBuffer, OriginalBlobAddress);
                } 
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::RemoteEndPoint_get() returning:" + m_RemoteEndPoint);
                return m_RemoteEndPoint; 
            } 
        }
 
        public /* override */ IPEndPoint LocalEndPoint {
            get {
                if (m_LocalEndPoint==null) {
                    m_LocalEndPoint = UnsafeNclNativeMethods.HttpApi.GetLocalEndPoint(RequestBuffer, OriginalBlobAddress); 
                }
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::LocalEndPoint_get() returning:" + m_LocalEndPoint); 
                return m_LocalEndPoint; 
            }
        } 

        //should only be called from httplistenercontext
        internal void Close() {
            if(Logging.On)Logging.Enter(Logging.HttpListener, this, "Close", ""); 
            RequestContextBase memoryBlob = m_MemoryBlob;
            if (memoryBlob != null) 
            { 
                memoryBlob.Close();
                m_MemoryBlob = null; 
            }
            m_IsDisposed = true;
            if(Logging.On)Logging.Exit(Logging.HttpListener, this, "Close", "");
        } 

 
        private ListenerClientCertAsyncResult AsyncProcessClientCertificate(AsyncCallback requestCallback, object state) { 
            if (m_ClientCertState == ListenerClientCertState.InProgress)
                throw new InvalidOperationException(SR.GetString(SR.net_listener_callinprogress, "GetClientCertificate()/BeginGetClientCertificate()")); 
            m_ClientCertState = ListenerClientCertState.InProgress;
            HttpListenerContext.EnsureBoundHandle();

            ListenerClientCertAsyncResult asyncResult = null; 
 			//-------------------------------------------------------------------
			//When you configure the HTTP.SYS with a flag value 2 
			//which means require client certificates, when the client makes the 
			//initial SSL connection, server (HTTP.SYS) demands the client certificate
 			// 
			//Some apps may not want to demand the client cert at the beginning
 			//perhaps server the default.htm. In this case the HTTP.SYS is configured
 			//with a flag value other than 2, whcih means that the client certificate is
			//optional.So intially when SSL is established HTTP.SYS won't ask for client 
 			//certificate. This works fine for the default.htm in the case above
			//However, if the app wants to demand a client certficate at a later time 
			//perhaps showing "YOUR ORDERS" page, then the server wans to demand 
			//Client certs. this will inturn makes HTTP.SYS to do the
 			//SEC_I_RENOGOTIATE through which the client cert demand is made 
			//
 			//THE
 
 
 
 
 

  

 
 
 
 
 
 
            if (m_SslStatus != SslStatus.Insecure)
            { 
                // at this point we know that DefaultFlags has the 2 bit set (Negotiate Client certificate)
                // the cert, though might or might not be there. try to retrieve it
                // this number is the same that IIS decided to use
                uint size = CertBoblSize; 
                asyncResult = new ListenerClientCertAsyncResult(this, state, requestCallback, size);
                try { 
                    while (true) 
                    {
                        GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate() calling UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate size:" + size); 
                        uint bytesReceived = 0;

                        uint statusCode =
                            UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate( 
                                HttpListenerContext.RequestQueueHandle,
                                m_ConnectionId, 
                                (uint)UnsafeNclNativeMethods.HttpApi.HTTP_FLAGS.NONE, 
                                asyncResult.RequestBlob,
                                size, 
                                &bytesReceived,
                                asyncResult.NativeOverlapped);

                        GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate() call to UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate returned:" + statusCode + " bytesReceived:" + bytesReceived); 
                        if (statusCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_MORE_DATA)
                        { 
                            UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO* pClientCertInfo = asyncResult.RequestBlob; 
                            size = bytesReceived + pClientCertInfo->CertEncodedSize;
                            asyncResult.Reset(size); 
                            continue;
                        }
                        if (statusCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS &&
                            statusCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_IO_PENDING) { 
                            // someother bad error, possible(?) return values are:
                            // ERROR_INVALID_HANDLE, ERROR_INSUFFICIENT_BUFFER, ERROR_OPERATION_ABORTED 
                            // Also ERROR_BAD_DATA if we got it twice or it reported smaller size buffer required. 
                            throw new HttpListenerException((int)statusCode);
                        } 
                        break;
                    }
                }
                catch { 
                    if (asyncResult!=null) {
                        asyncResult.InternalCleanup(); 
                    } 
                    throw;
                } 
            } else {
                asyncResult = new ListenerClientCertAsyncResult(this, state, requestCallback, 0);
                asyncResult.InvokeCallback();
            } 
            return asyncResult;
        } 
 
        private void ProcessClientCertificate() {
            if (m_ClientCertState == ListenerClientCertState.InProgress) 
                throw new InvalidOperationException(SR.GetString(SR.net_listener_callinprogress, "GetClientCertificate()/BeginGetClientCertificate()"));
            m_ClientCertState = ListenerClientCertState.InProgress;
            GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate()");
			//-------------------------------------------------------------------- 
 			//When you configure the HTTP.SYS with a flag value 2
			//which means require client certificates, when the client makes the 
 			//initial SSL connection, server (HTTP.SYS) demands the client certificate 
 			//
			//Some apps may not want to demand the client cert at the beginning 
 			//perhaps server the default.htm. In this case the HTTP.SYS is configured
			//with a flag value other than 2, whcih means that the client certificate is
			//optional.So intially when SSL is established HTTP.SYS won't ask for client
			//certificate. This works fine for the default.htm in the case above 
 			//However, if the app wants to demand a client certficate at a later time
			//perhaps showing "YOUR ORDERS" page, then the server wans to demand 
 			//Client certs. this will inturn makes HTTP.SYS to do the 
 			//SEC_I_RENOGOTIATE through which the client cert demand is made
			// 
 			//THE


 
 
 
  
 
 
 


 
 
 
            if (m_SslStatus != SslStatus.Insecure) 
            {
                // at this point we know that DefaultFlags has the 2 bit set (Negotiate Client certificate) 
                // the cert, though might or might not be there. try to retrieve it
                // this number is the same that IIS decided to use
                uint size = CertBoblSize;
                while (true) 
                {
                    byte[] clientCertInfoBlob = new byte[checked((int) size)]; 
                    fixed (byte* pClientCertInfoBlob = clientCertInfoBlob) 
                    {
                        UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO* pClientCertInfo = (UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO*) pClientCertInfoBlob; 

                        GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate() calling UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate size:" + size);
                        uint bytesReceived = 0;
 
                        uint statusCode =
                            UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate( 
                                HttpListenerContext.RequestQueueHandle, 
                                m_ConnectionId,
                                (uint)UnsafeNclNativeMethods.HttpApi.HTTP_FLAGS.NONE, 
                                pClientCertInfo,
                                size,
                                &bytesReceived,
                                null); 

                        GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate() call to UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate returned:" + statusCode + " bytesReceived:" + bytesReceived); 
                        if (statusCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_MORE_DATA) { 
                            size = bytesReceived + pClientCertInfo->CertEncodedSize;
                            continue; 
                        }
                        else if (statusCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS) {
                            if (pClientCertInfo!=null) {
                                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate() pClientCertInfo:" + ValidationHelper.ToString((IntPtr)pClientCertInfo) 
                                    + " pClientCertInfo->CertFlags:" + ValidationHelper.ToString(pClientCertInfo->CertFlags)
                                    + " pClientCertInfo->CertEncodedSize:" + ValidationHelper.ToString(pClientCertInfo->CertEncodedSize) 
                                    + " pClientCertInfo->pCertEncoded:" + ValidationHelper.ToString((IntPtr)pClientCertInfo->pCertEncoded) 
                                    + " pClientCertInfo->Token:" + ValidationHelper.ToString((IntPtr)pClientCertInfo->Token)
                                    + " pClientCertInfo->CertDeniedByMapper:" + ValidationHelper.ToString(pClientCertInfo->CertDeniedByMapper)); 
                                if (pClientCertInfo->pCertEncoded!=null) {
                                    try {
                                        byte[] certEncoded = new byte[pClientCertInfo->CertEncodedSize];
                                        Marshal.Copy((IntPtr)pClientCertInfo->pCertEncoded, certEncoded, 0, certEncoded.Length); 
                                        m_ClientCertificate = new X509Certificate2(certEncoded);
                                    } 
                                    catch (CryptographicException exception) { 
                                        GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate() caught CryptographicException in X509Certificate2..ctor():" + ValidationHelper.ToString(exception));
                                    } 
                                    catch (SecurityException exception) {
                                        GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::ProcessClientCertificate() caught SecurityException in X509Certificate2..ctor():" + ValidationHelper.ToString(exception));
                                    }
                                } 
                                m_ClientCertificateError = (int)pClientCertInfo->CertFlags;
                            } 
                        } 
                        else {
                            GlobalLog.Assert(statusCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_NOT_FOUND, "HttpListenerRequest#{0}::ProcessClientCertificate()|Call to UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate() failed with statusCode {1}.", ValidationHelper.HashString(this), statusCode); 
                        }
                    }
                    break;
                } 
            }
            m_ClientCertState = ListenerClientCertState.Completed; 
        } 

        private string RequestScheme { 
            get {
                return IsSecureConnection ? "https" : "http";
            }
        } 

        private Uri RequestUri { 
            get { 
                if (m_RequestUri == null) {
 
                    m_RequestUri = HttpListenerRequestUriBuilder.GetRequestUri(
                        m_RawUrl, RequestScheme, m_CookedUrlHost, m_CookedUrlPath, m_CookedUrlQuery);
                }
 
                GlobalLog.Print("HttpListenerRequest#" + ValidationHelper.HashString(this) + "::RequestUri_get() returning m_RequestUri:" + ValidationHelper.ToString(m_RequestUri));
                return m_RequestUri; 
            } 
        }
 
        /*
        private DateTime IfModifiedSince {
            get {
                string headerValue = GetKnownHeader(HttpRequestHeader.IfModifiedSince); 
                if (headerValue==null) {
                    return DateTime.Now; 
                } 
                return DateTime.Parse(headerValue, CultureInfo.InvariantCulture);
            } 
        }
        */

        private string GetKnownHeader(HttpRequestHeader header) { 
            return UnsafeNclNativeMethods.HttpApi.GetKnownHeader(RequestBuffer, OriginalBlobAddress, (int) header);
        } 
 
        internal ChannelBinding GetChannelBinding()
        { 
            return HttpListenerContext.Listener.GetChannelBindingFromTls(m_ConnectionId);
        }

        internal void CheckDisposed() { 
            if (m_IsDisposed) {
                throw new ObjectDisposedException(this.GetType().FullName); 
            } 
        }
 
        // <


 

        static class Helpers { 
            // 
            // Get attribute off header value
            // 
            internal static String GetAttributeFromHeader(String headerValue, String attrName) {
                if (headerValue == null)
                    return null;
 
                int l = headerValue.Length;
                int k = attrName.Length; 
 
               // find properly separated attribute name
                int i = 1; // start searching from 1 

                while (i < l) {
                    i = CultureInfo.InvariantCulture.CompareInfo.IndexOf(headerValue, attrName, i, CompareOptions.IgnoreCase);
                    if (i < 0) 
                        break;
                    if (i+k >= l) 
                        break; 

                    char chPrev = headerValue[i-1]; 
                    char chNext = headerValue[i+k];
                    if ((chPrev == ';' || chPrev == ',' || Char.IsWhiteSpace(chPrev)) && (chNext == '=' || Char.IsWhiteSpace(chNext)))
                        break;
 
                    i += k;
                } 
 
                if (i < 0 || i >= l)
                    return null; 

               // skip to '=' and the following whitespaces
                i += k;
                while (i < l && Char.IsWhiteSpace(headerValue[i])) 
                    i++;
                if (i >= l || headerValue[i] != '=') 
                    return null; 
                i++;
                while (i < l && Char.IsWhiteSpace(headerValue[i])) 
                    i++;
                if (i >= l)
                    return null;
 
               // parse the value
                String attrValue = null; 
 
                int j;
 
                if (i < l && headerValue[i] == '"') {
                    if (i == l-1)
                        return null;
                    j = headerValue.IndexOf('"', i+1); 
                    if (j < 0 || j == i+1)
                        return null; 
 
                    attrValue = headerValue.Substring(i+1, j-i-1).Trim();
                } 
                else {
                    for (j = i; j < l; j++) {
                        if (headerValue[j] == ' ' || headerValue[j] == ',')
                            break; 
                    }
 
                    if (j == i) 
                        return null;
 
                    attrValue = headerValue.Substring(i, j-i).Trim();
                }

                return attrValue; 
            }
 
            internal static String[] ParseMultivalueHeader(String s) { 
                if (s == null)
                    return null; 

                int l = s.Length;

               // collect comma-separated values into list 

                ArrayList values = new ArrayList(); 
                int i = 0; 

                while (i < l) { 
                   // find next ,
                    int ci = s.IndexOf(',', i);
                    if (ci < 0)
                        ci = l; 

                   // append corresponding server value 
                    values.Add(s.Substring(i, ci-i)); 

                   // move to next 
                    i = ci+1;

                   // skip leading space
                    if (i < l && s[i] == ' ') 
                        i++;
                } 
 
               // return list as array of strings
 
                int n = values.Count;
                String[] strings;

                // if n is 0 that means s was empty string 

                if (n == 0) { 
                    strings = new String[1]; 
                    strings[0] = String.Empty;
                } 
                else {
                    strings = new String[n];
                    values.CopyTo(0, strings, 0, n);
                } 
                return strings;
            } 
 

            private static string UrlDecodeStringFromStringInternal(string s, Encoding e) { 
                int count = s.Length;
                UrlDecoder helper = new UrlDecoder(count, e);

                // go through the string's chars collapsing %XX and %uXXXX and 
                // appending each char as char, with exception of %XX constructs
                // that are appended as bytes 
 
                for (int pos = 0; pos < count; pos++) {
                    char ch = s[pos]; 

                    if (ch == '+') {
                        ch = ' ';
                    } 
                    else if (ch == '%' && pos < count-2) {
                        if (s[pos+1] == 'u' && pos < count-5) { 
                            int h1 = HexToInt(s[pos+2]); 
                            int h2 = HexToInt(s[pos+3]);
                            int h3 = HexToInt(s[pos+4]); 
                            int h4 = HexToInt(s[pos+5]);

                            if (h1 >= 0 && h2 >= 0 && h3 >= 0 && h4 >= 0) {   // valid 4 hex chars
                                ch = (char)((h1 << 12) | (h2 << 8) | (h3 << 4) | h4); 
                                pos += 5;
 
                                // only add as char 
                                helper.AddChar(ch);
                                continue; 
                            }
                        }
                        else {
                            int h1 = HexToInt(s[pos+1]); 
                            int h2 = HexToInt(s[pos+2]);
 
                            if (h1 >= 0 && h2 >= 0) {     // valid 2 hex chars 
                                byte b = (byte)((h1 << 4) | h2);
                                pos += 2; 

                                // don't add as char
                                helper.AddByte(b);
                                continue; 
                            }
                        } 
                    } 

                    if ((ch & 0xFF80) == 0) 
                        helper.AddByte((byte)ch); // 7 bit have to go as bytes because of Unicode
                    else
                        helper.AddChar(ch);
                } 

                return helper.GetString(); 
            } 

            private static int HexToInt(char h) { 
                return( h >= '0' && h <= '9' ) ? h - '0' :
                ( h >= 'a' && h <= 'f' ) ? h - 'a' + 10 :
                ( h >= 'A' && h <= 'F' ) ? h - 'A' + 10 :
                -1; 
            }
 
            private class UrlDecoder { 
                private int _bufferSize;
 
                // Accumulate characters in a special array
                private int _numChars;
                private char[] _charBuffer;
 
                // Accumulate bytes for decoding into characters in a special array
                private int _numBytes; 
                private byte[] _byteBuffer; 

                // Encoding to convert chars to bytes 
                private Encoding _encoding;

                private void FlushBytes() {
                    if (_numBytes > 0) { 
                        _numChars += _encoding.GetChars(_byteBuffer, 0, _numBytes, _charBuffer, _numChars);
                        _numBytes = 0; 
                    } 
                }
 
                internal UrlDecoder(int bufferSize, Encoding encoding) {
                    _bufferSize = bufferSize;
                    _encoding = encoding;
 
                    _charBuffer = new char[bufferSize];
                    // byte buffer created on demand 
                } 

                internal void AddChar(char ch) { 
                    if (_numBytes > 0)
                        FlushBytes();

                    _charBuffer[_numChars++] = ch; 
                }
 
                internal void AddByte(byte b) { 
                    // if there are no pending bytes treat 7 bit bytes as characters
                    // this optimization is temp disable as it doesn't work for some encodings 
    /*
                    if (_numBytes == 0 && ((b & 0x80) == 0)) {
                        AddChar((char)b);
                    } 
                    else
    */ 
                    { 
                        if (_byteBuffer == null)
                            _byteBuffer = new byte[_bufferSize]; 

                        _byteBuffer[_numBytes++] = b;
                    }
                } 

                internal String GetString() { 
                    if (_numBytes > 0) 
                        FlushBytes();
 
                    if (_numChars > 0)
                        return new String(_charBuffer, 0, _numChars);
                    else
                        return String.Empty; 
                }
            } 
 

            internal static void FillFromString(NameValueCollection nvc, String s, bool urlencoded, Encoding encoding) { 
                int l = (s != null) ? s.Length : 0;
                int i = (s.Length>0 && s[0]=='?') ? 1 : 0;

                while (i < l) { 
                    // find next & while noting first = on the way (and if there are more)
 
                    int si = i; 
                    int ti = -1;
 
                    while (i < l) {
                        char ch = s[i];

                        if (ch == '=') { 
                            if (ti < 0)
                                ti = i; 
                        } 
                        else if (ch == '&') {
                            break; 
                        }

                        i++;
                    } 

                    // extract the name / value pair 
 
                    String name = null;
                    String value = null; 

                    if (ti >= 0) {
                        name = s.Substring(si, ti-si);
                        value = s.Substring(ti+1, i-ti-1); 
                    }
                    else { 
                        value = s.Substring(si, i-si); 
                    }
 
                    // add name / value pair to the collection

                    if (urlencoded)
                        nvc.Add( 
                           name == null ? null : UrlDecodeStringFromStringInternal(name, encoding),
                           UrlDecodeStringFromStringInternal(value, encoding)); 
                    else 
                        nvc.Add(name, value);
 
                    // trailing '&'

                    if (i == l-1 && s[i] == '&')
                        nvc.Add(null, ""); 

                    i++; 
                } 
            }
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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